Alright, let's work through 85124854 times 66080513 step by step
85124854 × 66080513 = 66080513 × (85124854)
+ 66080513 × 4 that is equal 264322052
+ 66080513 × 50 that results in 3304025650
+ 66080513 × 800 that is equal 52864410400
+ 66080513 × 4000 giving us 264322052000
+ 66080513 × 20000 that equals 1321610260000
+ 66080513 × 100000 which equals 6608051300000
+ 66080513 × 5000000 resulting in 330402565000000
+ 66080513 × 80000000 that equals 5286441040000000

= 5625094021370102
